DISCUSSION OF SPECIES AND THEIR DISTRIBUTION. 71 



of anal, overlapping it little or not at all. Ventrals, 8-rayed, under or but .slightly in front 

 lit' first dorsal rays: pectorals wel] developed; soft dorsal slender. 



Precaudal photophores 2; superanals in two groups, with one or two posterolaterals 

 above the interval between them. 



I. Mediolateral photophores :>. in obliquely vertical line. Anterolateral 1. Posterolateral 1. 



A. Pectoral short. Precaudal photophores close together. 



1. Posterolateral in front of soft dorsal. I). 12: A. 19; L. lat. 41-45 M. PUNCTATUM 



2. Posterolateral under soft dorsal or nearly so. 



a. L.lat.37. Superanals, 7-10 + 4-6. D. ?;A. ? M. .uiixf, 



b. L. lat. 10. Superanals, 8 + 6. D. 12; A. 20 M. OPALINUM* 



B. Pectoral long, falcate. Precaudal photophores somewhat apart. 



1. Posterolateral in front of soft dorsal. 



a. L. lat. 38. Superanals, 6-7 + 7-9. D. 12; A. 21 M. PHENGODES 



II. Mediolaterals 2, anterolaterals 2. 



A. Posterolateral 1, over break in superanal series. 



1. Pectoral long, falcate, passing seoond anterolateral. Precaudals somewhat apart. 



a. Posterolateral in advance of soft dorsal and behind middle of anal. ^ 



i. L. lat. 40-12. Superanals, 7-9 + 4-9. D. 12-14; A. 20-22 M. humboldtii 



2. Pectoral moderate, not passing second anterolateral. Precaudals close together. 



a. Posterolateral far in advance of soft dorsal, and over middle of anal. 



i. L. lat. 41. Superanals, 5-7 + 11-14. D. 12; A. 19 M. GRACILE 



B. Posterolaterals 2, over break in anal series. 



1. Anterolaterals side by side, and continuous with first mediolateral. 



a. Anterolaterals far apart; precaudals near together, the last far below end of lateral line. 



i. L. lat. 39-40. Superanals, 5-6 + 6-7. D. 12-13; A. 17-18 M. henoiti 



b. Anterolaterals close together; precaudals well separated; tin' last near end of lateral line. 



i. L.lat. (?). Superanals, 4-7 + 7-8. D. 11; A. 16 M. reiniiakdtii 



2. Anterolaterals not side by side, the first above and in advance of the second, and touching lateral 



line. 



a. L. lat. 38-42. Superanals, 7 + 6. D.12;A.21-22 M. remiger 



b. L. lat. (?). Superanals, 5-7 + 6. D. 12; A. 19 M. iivgomii 



MYCTOPHUM PUNCTATUM, Ramnesque. (Figure 80.) 



Myctophumpunctatum, Rafinesqce. Ind. d'lttiologia Sieillana. 1810,56, pi. it, Fig. o. (Nyethophum punctatum, 

 Cocco. in synonymy of his V. liafinesquei .) — Bonaparte, Icon. Faun. Ital., fasc. xxxvn, Fig. 



Scopelus caninianus, Cuvier and Valenciennes, Hist. Nat. Poiss, xxn, p. 445. — Gunther, Cat. Fish. Brit. 

 Mus., V, 409. — Canestrini, Fauna d'ltalia, Pesei, 124. — Giglioli, Elenco, 100.— Raffaele, Mitt. Zool. 

 Slat., Naples, ix, 183, pi. vn, Fig. 4.— Lutken, Vid. Med. Xat urh. Fbrh., 1891, 207. 



Seop( lua tfulleri, Goode, Fishery Industries, etc., 1889, Part 1, Atlas, pi. ccm. 



Height of body 44 in total length; width equal to length of eye; length of head 3^ 

 times. Least depth of tail two-fifths of height of body. Greatest depth of head about 

 three-fourths of its length. Distance between posterior margin of orbit and preopercular 

 edge one-third of diameter of eye. Snout very short, with a very inconspicuous keel on 

 upper edge ; its length scarcely one-third diameter of eye. Gill rakers 7 above and 19 belt >w 

 angle of first arch, the longest two thirds diameter of eye. Eye very large, its diameter 

 three-sevenths of length of head. The intermaxillary reaches almost to angle of preoper- 

 eulnm. Origin of dorsal much nearer to tip of snout than to root of caudal; the fin is very 

 short, the length of its base equal to half that of head and less than one-sixth of total; its 

 origin is over eleventh scale of lateral line, and is vertical with origin of ventral, the length 

 of its longest ray equal to two-thirds length of head. Ventral far from reaching origin of 

 anal; its length less than diameter of the eye. Pectoral reaches to middle of ventral, below 

 twelfth scale of lateral line, its length equal to that of postorbital part of head. Adipose 

 dorsal present, over antepenultimate ray of anal. Anal origin under twenty-first scale of 

 lateral line; its base as long as head, and its longest ray equal to length oi postorbital part 

 of head. Caudal rather small and deeply forked. Mediolateral photophores three, in 

 straight, obliquely ascending line; anterolateral photophore single; posterolateral single, 

 over break in row ot superanals and placed considerably in advance of soft dorsal. 

 Precaudal photophores close together. Radial formula: U. II, 12; A. II, 19; L. lat. 41-45. 



